> Taking the opportunity to ask: are there nice recommended resources for a beginner to start with reverse engineering (ideally using Ghidra)? Let's say for an experienced developer, but not so experienced in reverse engineering?

The good news is that there has never been MORE resources out there. If you want to use this learning expedition as an excuse to also build up a small electronics lab then $100 on ali express to buy whatever looks cheap and interesting and then tear it apart and start poking around to find where the firmware lives. Pull the firmware, examine it, modify it and put it back :)

This guy has a discord server with a specific "book club" section where they all choose a cheap $thing and reverse engineer it: https://www.youtube.com/@mattbrwn/about

I can't help much with "traditional" app/software RE work, sorry.